My nano tank

[hcakebax1]

I made all the analysis to my tank and everithing is ok. Beeing loocking that there are a lot of bubbles and a brown moisture in the bottom. I change 50% of the water and steel doing the same think. My cleaning shrimp died. What it could be. HELP Thanks.

 

[KrisDeitz]

how old is the tank?? sounds new

 

[hcakebax1]

it has 6 months. I clean and change water and the walls are fool of green algae and the water has like little moist in the tank,